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Plant-growth-promoting properties of endophytic bacteria isolated from Scots pine needles.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysiologisk botanik. Swedish University of Agricultural Sciences. (Annika Nordin, UPSC, Genfys, SLU)
2023 (Engelska)Självständigt arbete på avancerad nivå (masterexamen), 30 poäng / 45 hpStudentuppsats (Examensarbete)
Abstract [en]

The inner tissue of the plant is colonized by a myriad of bacteria, which can either be latent pathogens, neutral or beneficial. Bacteria with a beneficial influence, so called plant-growth-promoting bacteria (PGPB) can promote plant growth and fitness through various direct and indirect mechanisms. Several agricultural plants have been shown to receive plant-growth-promotion through endophytic bacteria, but less is known about their role in natural ecosystems like the boreal forest and their influence on conifer growth. Several endophytic bacteria have been isolated from conifers like lodgepole pine (Pinus contorta Loudon) or Scots pine (Pinus sylvestris L.), however, when investigating their plant-growth-promoting properties the focus has been strongly on nitrogen fixation. To investigate which additional plant-growth promoting properties endophytic nitrogen-fixing bacteria in conifers may have, bacteria were isolated from Scots pine needles, identified using 16s rRNA sequencing, and screened for their plant-growth-promoting properties by in vitro assays. To test the bacteria’s ability to promote the growth of a non-native crop host under nitrogen poor conditions, cucumber plants grown in unfertilized peat and perlite were inoculated with the isolated bacteria. Two endophytic nitrogen-fixing bacteria were isolated from Scots pine needles. The isolated bacteria were shown to be nitrogen-fixing, phosphorus solubilising, and were able to produce indole-3-acetic acid (IAA), protease and cellulase. However, no significant plant growth promotion by treatment of cucumber with the bacteria was detected. 

Ort, förlag, år, upplaga, sidor
2023. , s. 32
Nationell ämneskategori
Mikrobiologi
Identifikatorer
URN: urn:nbn:se:umu:diva-212941OAI: oai:DiVA.org:umu-212941DiVA, id: diva2:1788894
Utbildningsprogram
Masterprogrammet i växt- och skogsbioteknik
Presentation
2023-06-15, 13:30 (Engelska)
Handledare
Examinatorer
Tillgänglig från: 2024-02-08 Skapad: 2023-08-17 Senast uppdaterad: 2024-02-08Bibliografiskt granskad

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